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Seminar @ Institute of Physics, Tuesday 22nd Mar 2022 at 11:00,
2nd floor in 1st wing and Zoom<br>
<br>
<strong><span style="color: #55913c; font-family: 'roman';"
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new roman' , 'new york' , 'times' , serif;"><span
dir="ltr">Resonant Inelastic X-ray Scattering
Experiments at the SEXTANTS Beamline and
Perspectives for RIXS Under Electric and Magnetic
Fields</span></span></span></span></span></span></strong><b><br>
</b>
<div><span style="font-family: 'century gothic' , sans-serif;
font-size: 14pt;" data-mce-style="font-family: 'century
gothic' , sans-serif; font-size: 14pt;"><b><span
class="markedContent" id="page3R_mcid1"><span
style="font-family: sans-serif;" dir="ltr"
data-mce-style="font-family: sans-serif;">D</span><span
style="font-family: sans-serif;" dir="ltr"
data-mce-style="font-family: sans-serif;">r</span><span
style="font-family: sans-serif;" dir="ltr"
data-mce-style="font-family: sans-serif;">. Alessandro
Nicolaou<br>
</span></span></b></span></div>
<div style="color: #000000;" data-mce-style="color: #000000;"> </div>
<div style="text-align: center;" data-mce-style="text-align:
center;">
<div><span style="font-family: 'century gothic' , sans-serif;"
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style="font-size: 14.6667px;" data-mce-style="font-size:
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data-mce-style="font-size: 11pt;"><span
style="font-family: sans-serif;" dir="ltr"
data-mce-style="font-family: sans-serif;">Synchrotron
SOLEIL, L’Orme des Merisiers, Saint-Aubin, BP 48,
91192 Gif-sur-Yvette,France</span><span
style="font-family: sans-serif;" dir="ltr"
data-mce-style="font-family: sans-serif;"></span></span></b></span></span></div>
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<br>
<div style="text-align: justify;" data-mce-style="text-align:
justify;" align="justify">Resonant inelastic X-ray scattering
(RIXS) is a photon-in photon-out technique in which the system is
resonantly excited at an absorption edge and the scattered photons
are measured in order to probe the energy and momentum transfer of
the intrinsic excitations, such as electronic, magnetic or of the
lattice. This spectroscopy has been subject of a remarkable
progress in the last decades for its capability of gaining
information of fundamental interest for correlated systems. <br>
At the SEXTANTS beamline of the synchrotron SOLEIL, we perform
RIXS experiments in the soft X-ray regime. After a short
presentation of the technique, I will highlight some of the main
experimental results we recently obtained. One example is
represented by the work on La1-xSrxVO3, a canonical example of
correlated system exhibiting a filling control metal-insulator
transition, as well as orbital and antiferromagnetic orderings at
low temperature. I will show how low-doping (x=0.1) affects the
electronic structure primarily on the O sites, at odds with a
simple Mott-Hubbard picture, and how RIXS can measure orbital
excitations and their behavior with temperature. I will discuss
how these results can be only partially understood by a local
model based on crystal field theory calculations. <br>
Finally, I will describe the capabilities of the novel MAGELEC
sample environment, which was conceived for performing RIXS
experiments under electric and magnetic fields in a temperature
range from 400 K down to 18 K. MAGELEC consists of sample holder
equipped with 12 electrical contacts, which is combined with a
compact quadrupolar magnet delivering a rotatable magnetic field
up to 0.45 T. Thanks to the particular design of the
electromagnet, the whole scattering plane is available for
magnetic circular and linear dichroism RIXS experiments. I will
show how this unique sample environment, accessible for external
users since February 2020, opens new perspectives at the SEXTANTS
beamline thanks to the possibility to tackle several kinds of open
questions in the field of transition metal compounds beyond the
accuracy obtained by the widely used X-ray magnetic circular
dichroism and in operando conditions. <br>
<br>
Join Zoom Meeting<br>
</div>
<a
href="https://zoom.us/j/92983064161?pwd=blhQRVkwN3krYlh0bEJKQU1MZjJjZz09">https://zoom.us/j/92983064161?pwd=blhQRVkwN3krYlh0bEJKQU1MZjJjZz09<br>
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Meeting ID: 929 8306 4161<br>
Passcode: 881514<br>
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